{"id":"CVE-2026-67863","aliases":["DEBIAN-CVE-2026-67863","EUVD-2026-53671","GHSA-j8g3-2qjc-25x2","UBUNTU-CVE-2026-67863"],"status":"published","title":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path....","description":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00737,"percentile":0.54962,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2026-08-05T00:00:00Z","modified":"2026-10-17T13:00:40Z","affected":[{"source":"osv","ecosystem":"Debian:13","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.18-1"]},{"source":"osv","ecosystem":"Debian:14","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.18-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1build1","1.4.18-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.11.1-1build1"]}],"references":[{"url":"https://github.com/open62541/open62541/issues/8131","tags":["exploit","report"]},{"url":"https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/server.h","tags":["report"]},{"url":"https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription.c","tags":["report"]},{"url":"https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_monitoreditem.c","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67863"},{"url":"https://github.com/advisories/GHSA-j8g3-2qjc-25x2"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-67863","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-67863","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67863","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-67863","description":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.","status":"published","published":"2026-08-05T00:00:00Z","modified":"2026-08-07T12:53:10.651Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:20:06.562031Z"}],"euvd":[{"id":"EUVD-2026-53671","description":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.","status":"published","published":"2026-08-05T00:00:00Z","modified":"2026-08-07T12:53:10Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high"}],"updated_at":"2026-11-02T18:02:07.294457Z"}],"ghsa":[{"id":"GHSA-j8g3-2qjc-25x2","title":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path....","description":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.","status":"published","published":"2026-08-06T00:31:28Z","modified":"2026-08-07T15:33:07Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:10:11.041675Z"}],"nvd":[{"id":"CVE-2026-67863","description":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.","status":"published","published":"2026-08-05T23:16:53.753Z","modified":"2026-08-31T19:33:11.197Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:12:35.031043Z"}],"osv":[{"id":"DEBIAN-CVE-2026-67863","description":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.","status":"published","published":"2026-08-05T23:16:53.753Z","modified":"2026-10-01T03:03:48.290692049Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:46:01.68444Z"},{"id":"UBUNTU-CVE-2026-67863","description":"In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.","status":"published","published":"2026-08-05T23:16:00Z","modified":"2026-10-17T13:00:40.507468692Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:53.710209Z"}]}}